Equivalent Networks of Negative-Grid Vacuum Tubes at Ultra-High Frequencies

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Abstract
It is shown that the equivalent network of negative-grid vacuum tubes both at low and at very high frequencies may be expressed in many different forms. Several are suggested and the advantages of two are described in some detail. One of these is closely analogous to that which is in general use at low frequencies and requires only the addition of resistive components in series both with the cathode-grid and the grid-plate capacitances to make it applicable to frequencies where transit time effects are appreciable though moderately small. The resistance in series with the grid-plate capacitance is negative in sign. In this form of the equivalent network, electron transit times do not introduce a phase angle into the amplification factor. The paper is divided into two parts. The first gives a descriptive interpretation of the results while the second contains the mathematical manipulations.

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